JPH0573024B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an image display panel device, and more particularly, to an image display panel device in which a plurality of image display panels are two-dimensionally arranged for large-screen color image display. The present invention relates to a display panel device.

Conventional Structure and Problems There is a well-known method of two-dimensionally arranging a plurality of image display panels, for example, liquid crystal panels, in order to realize a large-screen image display panel.
However, as shown in FIG. 1, since the liquid crystal panel 1 has a spacer around the periphery for sealing liquid crystal, it has an invalid screen area 2 around the periphery. Therefore, when a plurality of liquid crystal panels 1 are arranged two-dimensionally as shown in FIG. 2, a grid-like invalid screen area 3 is created, and the viewer feels as if he/she is viewing the image through the grid-like pattern 3, which gives a strange feeling. It was hot.

Purpose of the Invention The present invention provides an image display panel device for eliminating the above-mentioned grid pattern and projecting a large-screen image that does not give a strange feeling when a plurality of image display panels are arranged two-dimensionally. This is what we provide.

Structure of the Invention The image display panel device of the present invention has light guide means arranged in front of the image display panel for each picture element, the distance between which increases as the distance from the image display panel increases, and the distance between the light guide means increases as the distance from the image display panel increases. It is constructed so that a light beam bending means, a wavelength selection means, and a light diffusion means are arranged at the end or in the middle, so that when a plurality of image display panels are arranged two-dimensionally, a grid-like invalid screen area is formed. This system prevents the appearance of brightness, provides a color image, prevents uneven brightness across the screen, and widens the viewing angle.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the image display panel device of the present invention will be described with reference to the drawings. FIG. 3 shows a cross section of an embodiment of a flat image display panel device according to the present invention. A light guide means 4 is disposed in front of the liquid crystal panel 1, and a color panel 5, a Fresnel lens 6, and a lenticular lens 7 are superimposed thereon as a wavelength selection means, a light beam bending means, and a light diffusion means, respectively. ing. light guide means 4, color panel 5,
The dimensions of the Fresnel lens 6 and the lenticular lens 7 are the same. The liquid crystal panel 1 has a structure in which two transparent substrates 8 are stacked with a spacer 9 in between, and a liquid crystal 10 is sealed inside. On the surface of the transparent substrate 8 on the liquid crystal 10 side, a large number of transparent electrodes 11,
12 are arranged in parallel with a required interval. The transparent electrodes 11 and 12 are arranged in directions perpendicular to each other, and both transparent electrodes 11 and 12
Each overlapping portion forms one pixel 13. A polarizing plate 14 is provided on the outer surface of the transparent substrate 8.
15 are arranged respectively. Furthermore, a planar light source 16 is arranged behind the liquid crystal panel 1.
The transmittance of each pixel 13 is changed by controlling the voltage applied to both transparent electrodes 11 and 12. color panel 5
As shown in FIG. 4, red (R), green (G), and blue (B) color filters are printed for each pixel 13 on the panel.
By combining this with the transmittance change in step 3, a full color image can be displayed.

As shown in FIG. 5, the light guide means 4 is constructed by combining thin metal light guide plates 17 in a lattice shape, and the spacing between the thin metal light guide plates 17 increases as the distance from the liquid crystal panel 1 increases. The end of the light guide means 4 on the liquid crystal panel 1 side is arranged so that its opening corresponds to each pixel 13 of the liquid crystal panel 1, and the opening at the other end of the light guide means 4 corresponds to each pixel 13 of the color panel 5. It is arranged so as to correspond to the pixel 13. The size of the light guide means 4 on the color panel 5 side is the same as or slightly larger than the overall external dimension of the liquid crystal panel 1. Therefore, the light guide means 4 works to enlarge each pixel of the liquid crystal panel 1 little by little, so that the invalid screen area caused by the spacers 9 around the liquid crystal panel 1 can be eliminated. By depositing a thin aluminum film on the surface of the light guide plate 17, its reflectance can be increased and the amount of light passing through the light guide means 4 can be prevented from attenuating.

The Fresnel lens 6 shown in FIG.
It has the effect of bending the light into a light ray 20 that is parallel or nearly parallel to the normal line 19 of the liquid crystal panel 1. The direction of the light ray 18 along the approximate central axis of each pixel 13 is
This almost coincides with the direction that gives the maximum brightness.
Therefore, if the Fresnel lens 6 is not attached, the light rays 18 will proceed straight, so when the image is observed from the direction of the normal line 19 of the liquid crystal panel 1,
The brightness clearly decreases at the periphery of the image, resulting in a dark image at the periphery. However, if the Fresnel lens 6 is attached here, the light ray 18 that provides the maximum brightness is almost uniformly parallel to the normal line of the liquid crystal panel 1, so that the brightness distribution over the entire screen can be made almost uniform.

The lenticular lens 7 has a cylindrical surface 2 that is long in the vertical direction when viewed from the observer on one side of a single transparent plate.
2 are formed regularly and parallel to each other. When the parallel light rays 20 exiting the Fresnel lens 6 enter the lenticular lens 7, light that is spread in the horizontal direction as seen from the observer emerges, so that the horizontal viewing angle can be widened. On the other hand, the lenticular lens 7 hardly changes the vertical viewing angle. Generally, in a large screen display, it is not necessary to make the vertical viewing angle very large, but it is desired to make the horizontal viewing angle as large as possible. Therefore, it is a very rational means to use a lenticular lens in a liquid crystal panel device as in the present invention. The color filter 5, Fresnel lens 6, and lenticular lens can be easily combined by using a connecting plate 23 that is sufficiently thinner than the size of one pixel 13, and by attaching each end face to the connecting plate 23 using adhesive. realizable.

As shown in FIG. 6, by two-dimensionally arranging a large number of the liquid crystal panel devices shown in FIG. 3 so that the coupling plates 23 are in close contact with each other, a large-screen color liquid crystal panel device can be realized. Each liquid crystal panel device is fixed to a grid frame 24. As a result, each liquid crystal panel device is arranged without any gaps to the viewer, and the viewer can see it as if it were one liquid crystal panel, which eliminates any sense of strangeness.

Other embodiments of the present invention will be described below.
In FIG. 7, a color filter 25 is formed directly on the flat side of the Fresnel lens 6. This saves the effort of bonding the color panel 5 and Fresnel lens 6 together. color filter 2
5 can be made by directly printing a dye onto the flat side of the Fresnel lens 6. It is also possible to form an interference filter on a plane by vapor deposition and use it as a wavelength selection means. It is also possible to form a color filter on the flat side of the lenticular lens 7.

Lens surface 2 of Fresnel lens 6 shown in FIG.
The direction of 6 is not limited, and the effect is exactly the same even if it is directed toward the liquid crystal panel.

Furthermore, as shown in FIG. 8, it is also possible to insert a prism 27 in the intermediate portion of the light guide means and form a color filter 28 for each prism.

FIG. 9 shows an example in which a light diffusing material is used as the light diffusing means. A light diffusing material is distributed inside the Fresnel lens 29. This light diffusing material can widen the viewing angle in the horizontal and vertical directions. Note that the light diffusing material may be distributed on the surface 30 of the Fresnel lens 29 on the liquid crystal panel 1 side, or the surface 31 on the opposite side. Also in this case, the configuration can be simplified by directly printing the color filter 32 on the Fresnel lens 29.

Note that the present invention is not limited to liquid crystal panels, but can also be applied to flat image display panels such as electroluminescent display panels, plasma display panels, photochromic display panels, and LED panels.

Effects of the Invention As explained above, the image display panel device according to the present invention can eliminate the invalid screen area that occurs when a large number of image display panels are arranged two-dimensionally, and furthermore, the brightness distribution over the entire screen can be made almost uniform. Furthermore, it is possible to provide a large-screen color image with a wide viewing angle, resulting in a very large effect.

[Brief explanation of drawings]

FIG. 1 is an external view of a general liquid crystal panel, FIG. 2 is a diagram for explaining the problems of the liquid crystal panel shown in FIG. 1, and FIG. 3 is an example of an image display panel device according to the present invention. FIG. 4 is a schematic diagram of a color panel, FIG. 5 is a perspective view of an embodiment of the light guide means, and FIG. 6 is a two-dimensional representation of many of the image display panels shown in FIG. 3. 7, 8, and 9 are cross-sectional views showing other embodiments of the wavelength selection means and the light diffusion means. 1...Liquid crystal panel, 4...Light guide means, 5...
...Color panel, 6...Fresnel lens, 7...
Lentei Kyura lens, 25...color filter, 27...prism.

Claims (1)

[Scope of Claims] 1. Light guide means is arranged in front of the image display panel for each pixel, the distance between which increases as the distance from the image display panel increases, and a light beam is provided at the end or middle of the light guide means. An image display panel device characterized in that a bending means, a wavelength selection means, and a light diffusion means are arranged. 2. The image display panel device according to claim 1, wherein the light guide means has an outer dimension on a side opposite to the image display panel that is the same as or larger than the outer dimension of the image display panel. 3. Claim 1, characterized in that the light guide means is a combination of thin plates in a lattice shape.
The image display panel device described in . 4. The light beam bending means bends the light beam along the substantially central axis of each of the light guide means in the normal direction of the image display panel or in a direction close to the normal line. The image display panel device described. 5. The image display panel device according to claim 1, wherein the light beam bending means is a Fresnel lens. 6. The image display panel device according to claim 1, wherein the light beam bending means is a prism. 7. The image display panel device according to claim 1, wherein the wavelength selection means includes a light absorption layer formed on the light beam bending means or the light diffusion means. 8. The image display panel device according to claim 1, wherein the wavelength selection means includes an interference film formed on the light beam bending means or the light diffusion means. 9. The image display panel device according to claim 5, wherein the light diffusing means has a diffusing material distributed inside or on the surface of the Fresnel lens. 10. The image display panel device according to claim 1, wherein the light diffusing means is a lenticular lens.